The links to Yahoo! and MapQuest maps which were once on Google have been removed by the search engine major. Earlier search for addresses or locations would give you choice between Google, Yahoo! and MapQuest maps but now there is only Google Maps.
Google is always working to improve search. The redesign of maps onebox better simplifies the Google user experience when looking for business and address information. Users will now be able to obtain directions and store their default location.
This move can affect traffic flow to the Yahoo! and MapQuest sites. Though MapQuest does not need to worry as it already has lot of direct traffic.